All Top up the processing of the front panel (The buttons are shaky and very small, and an annoying DVD / BD tray.).
Otherwise, everything is off and splashing around what you can do. All inputs / outputs which are so common.
For the settings on the setup you need to know something of audio and video standards already.
A buzzing noise I can not warnehmen but as some people think a Resonazbrummen does.
The hum does not always occur. I've learned that the most commonly affects lending BlueRays from the video store that have a sticker on it. But if I remember quite well on some purchased (but rarely).
Then begins the DVD / BD tray to hum, and that the plastic strip on the front of the tray. The fact is mounted on springs. When the charge goes to the loading continues purely into the device as the front mounted on springs.
If I namely the plastic strip purely express something then listens to the hum.
I was also able to detect a greenish tint in DVD as some claim.
I hope I could help you with it a little.